Join Date:Joined: Oct 2012
You can leave it on and not worry about heat, but here's the thing: the phone obviously stops charging at 100%, but once it stopped, the phone starts discharging, then it recharges to 100% again, discharges, recharges and this goes on until you pull it off. So while you can safely leave it on cause nothing dangerous will happen to you or the phone, know that it will be in a charging loop which can't be good for the battery.
Ideal thing would be the phone stopping charging altogether at 100%, and not recharging until hitting like 95%. Right now, when it notices the tiniest drop, it will recharge.